During Gastric Bypass surgery, we do not remove anything, we simply rewire the system. The surgeon creates a small stomach pocket of about 20-30 ml. This pocket is then paired directly with the small intestine. This creates the new stomach and because only a small amount of food is needed to fill the small stomach pocket, a signal will be sent early on indicating fullness and satisfaction to the brain. Usually, the hormonal control of hunger is positively affected by the surgery, resulting in a decrease in appetite.
Gastric Bypass surgery is a weight-loss method that is well established and that has been thoroughly studied, it has an excellent effect on obesity with only a few side effects when it is performed correctly. However, the surgery will cause the patient to eat dietary supplements in the form of vitamins and minerals throughout the rest of their life.
What happens to the big stomach? It will be fine for the entire life-span, even though it is not being used.